212738166 has 12 divisors (see below), whose sum is σ = 460932732. Its totient is φ = 70912716.

The previous prime is 212738161. The next prime is 212738173. The reversal of 212738166 is 661837212.

212738166 is a `hidden beast` number, since 212 + 7 + 381 + 66 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 212738166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212738161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5909376 + ... + 5909411.

It is an arithmetic number, because the mean of its divisors is an integer number (38411061).

Almost surely, 2^212738166 is an apocalyptic number.

212738166 is an abundant number, since it is smaller than the sum of its proper divisors (248194566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212738166 is a wasteful number, since it uses less digits than its factorization.

212738166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11818795 (or 11818792 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 212738166 is about 14585.5464758781. The cubic root of 212738166 is about 596.9644516429.

The spelling of 212738166 in words is "two hundred twelve million, seven hundred thirty-eight thousand, one hundred sixty-six".